轴力会降低结构频率，其影响对体系一阶频率很小，而对二阶以上频率和振型影响较大。
The axial force can decrease the frequency, but the influence is slight for the first mode frequency and large for the second mode and above obviously.
应用等效线性化方法得到方程组的线性化刚度矩阵，给出了结构等效一阶频率的计算方法；
Then, an equivalent linearization method is applied to get its linearized stiffness matrix. The estimating method for the equivalent fundamental frequency of the membrane is deduced.
利用冲击振动试验法可以准确得到桥墩的一阶振型和一阶频率，利用这两个参数可以构造出一阶振型比、特征参数、一阶曲率模态差三个指标。
The first-order mode and the first eigenfrequency of the pier can be obtained easily and precisely by the impact vibration test method, from which three indexes such as the chang.
我国现在仍是采用高耸或高层结构的荷载规范，只取结构的第一阶频率计算风振系数，按此方法进行大跨空间网格结构的风振分析是很不合理的。
In China, the high rise structures load code is used for the large span spatial structures, only the first frequency is taken account for the wind vibration analysis, which is not reasonable.
为使第二阶模态频率避开发动机一阶惯性力频率，文中对扶手架的质量、刚度进行局部修改，结果使手把振动有较大幅度的下降。
To separate these frequencies, we make a local modification to mass and stiffness of the handle and results in the vibration on the handle of walking tractor to reduce considerably.
通过实验分析，证实了对场分布影响较大的第一阶谐振频率是TE101模，TE101模的谐振频率是TEM传输室的上限使用频率。
Through the experiment, it was validated that the first frequency that have great effect on the field distribution is TE101, and the resonant frequency of TE101 is the limited frequency of TEM cell.
利用有限元分析软件ANSYS计算数控镗铣钻床主轴的静态变形与一阶固有频率。
Utilizing ANSYS, the static deformation and natural frequency for the spindle of the nc boring-milling machine are analyzed.
第一阶模态振型相对均值系统的变化很小。一般地，结构参数的随机变异对模态振型均值的影响大于对模态频率、模态阻尼比均值的影响。
In general, the variation of structure parameters has more effect on the mean values of mode than those of modal frequencies and modal damping ratios.
分析了一阶分形模糊控制滤波器的频率-幅度特性，白噪声和有色噪声分形盒维数的变化；
The frequency-magnitude response of the fractal filter and the change of fractal box dimension of white noise and color noise are analyzed.
采用高斯径向基函数和一阶剪切变形理论对普通复合材料叠合板的固有频率进行了计算。
The Gaussian radial basis functions and first-order shear deformation theory are presented to calculate the natural frequencies of generally laminated composite plates.
模态是结构的固有振动特性，每一阶模态都具有特定的固有频率、阻尼比、振型、模态刚度和模态质量。
Mode is structure's inherence characteristics, each mode has specifically resonant frequencies, damping values, mode shapes, mode stiffness and mode mass.
最后对结构进行了优化设计，优化后结构一阶固有频率提高35.7%，二阶以上固有频率提高63%以上。
The first nature frequency of the structure improved 35.7% and the second and upper nature frequencies of the structure improved over 63% after the optimum design.
笔者指出，当入射引力波和高斯束不同频率时，高斯束谐振系统产生的一阶扰动光子流没有观测效应。
This paper points out that the first-order perturbation photon flux produced by this system has not observed effect when GWs is different from frequency of Gaussian beam.
结果表明，夹板只对第一阶固有频率有较大提高。
The test result shows that clamper greatly increases only the first natural frequency.
本文研究了当某一阶固有频率与谐波频率接近或远离的情况下，谐波成分对识别的模态参数的影响，以及如何处理谐波模态。
When the natural frequency is close to or far from harmonic frequencies, study the effect of the harmonic components in the identified modal parameters, and how to deal with harmonic modal.
运用一阶单时间常数低通函数模拟运算放大器的开环增益，对RC桥式振荡电路进行线性分析，得出最大振荡频率为运算放大器增益带宽积的16.67%。
The maximum frequency of RC-bridge oscillator is 16.67% of gain bandwidth product of amplifier analyzed based on a first-order single time constant lowpass function model.
一阶固有频率下振动在试件疲劳寿命中所占的比重随着随机载荷谱均方应力值的降低而降低。
The percentage of fatigue life under first natural frequency of random spectra in fatigue life of specimen decreases with decreasing stress level of random spectra.
利用有限元法分析了某核电站排气钢塔的固有振动特性，即一阶、二阶振动频率及振型。
The finite element method is used to analyse the natural vibration of a exhaust chimney with steel structure in a nuclear power plant, such as the first, the second frequency and their model.
可以通过一阶固有频率下正弦振动试验试件寿命得到随机振动下试件的寿命。
Fatigue life of random vibration can be calculated by the fatigue life of sinusoidal vibration under first natural frequency.
该文采用上述情形的多普勒频率的分段一阶近似模型，在此基础上，提出一种基于推广RELAX算法的线性调频信号参量估计方法。
In this paper, the first order approximate model of Doppler frequency is assumed, and an algorithm based on the extended RELAX method is proposed to estimate the parameters of chirp signals.
本文研究了火箭弹自身缺陷的随机性。提出了通过合理设计发射装置一阶固有频率，克服火箭弹自身缺陷对落点散布的影响。
The paper studies the random question of rocket self-defect, puts forward a new method of reducing the effect of rocket dispersion by designing equitably the first nature frequency of launcher.
为避免桥梁共振，设计时应满足第一阶竖向自振频率大于车辆最大速度与车辆长度的比值。
To avoid the most dangerous resonance, the first vertical frequency of the bridge should be greater than the ratio of the maximum vehicle speed to the vehicle length in design.
利用有限元分析软件ANSYS对这种结构进行模态分析，得到其共振频率和一阶振动图；
Then the new structure is simulated with modal analysis by finite element analysis software ANSYS, and the resonant frequency and the first vibration map are presented.
给出了其在硬激励和软激励情况下的一阶近似解和共振情况下的频率响应方程。
And the first order approximate solution in the cases of hard excitation and soft excitation and the frequency resonance equation in the case of resonance are given.
将并联型有源电力滤波器控制成一阶惯性环节，在不同开关频率时分析各次谐波与补偿特性的定量关系。
A first-order inertia element was considered as the approximate model of SAPF. The compensation characteristic for each order harmonic current was obtained at different switching frequencies.
试验结果表明：随着激励振级加大，板状燃料组件的第一阶共振频率减小；
As excitation magnitude increases, the 1st resonant frequency of the parallel plate fuel assembly decreases.
分析结果表明，优化后的主溜板在满足最大变形约束要求下，第一阶自然频率提高31.2%，材料节省7.8%。
Simulation with the optimized tool slide shows that the first order natural frequency is increased by 31.2% and material savings of 7.8%.
结果表明，基于转子的一阶、二阶和三阶临界转速以及轴向固有频率幅值能有效地检测涡轮泵的故障。
The results show that the turbopump faults can be detected effectively by using the amplitudes of rotor first, second and third order critical frequency as well as axial intrinsic frequency.
结果表明，基于转子的一阶、二阶和三阶临界转速以及轴向固有频率幅值能有效地检测涡轮泵的故障。
The results show that the turbopump faults can be detected effectively by using the amplitudes of rotor first, second and third order critical frequency as well as axial intrinsic frequency.
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